/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.eagle.alert.engine.publisher;

import org.apache.eagle.alert.engine.model.AlertStreamEvent;

import java.util.ArrayList;
import java.util.List;

public class PipeStreamFilter implements AlertStreamFilter {

    private final List<AlertStreamFilter> filters;

    public PipeStreamFilter(AlertStreamFilter... filters) {
        this.filters = new ArrayList<>();
        for (AlertStreamFilter filter : filters) {
            this.filters.add(filter);
        }
    }

    @Override
    public AlertStreamEvent filter(AlertStreamEvent event) {
        AlertStreamEvent current = event;
        for (AlertStreamFilter filter : this.filters) {
            if (current == null) {
                return null;
            }
            current = filter.filter(current);
        }
        return current;
    }
}